linux-kernel - Re: [RFC PATCH] memory driver: make phys_index/end_phys_index reflect the start/end section number

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Message-ID: <1396489816.2913.25.camel@ThinkPad-T5421.cn.ibm.com>
Date:	Thu, 03 Apr 2014 09:50:16 +0800
From:	Li Zhong <zhong@...ux.vnet.ibm.com>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, nfont@...ux.vnet.ibm.com,
	gregkh@...uxfoundation.org
Subject: Re: [RFC PATCH] memory driver: make phys_index/end_phys_index
 reflect the start/end section number

On Wed, 2014-04-02 at 09:09 -0700, Dave Hansen wrote:
> On 04/02/2014 01:56 AM, Li Zhong wrote:
> > I noticed the phys_index and end_phys_index under 
> > /sys/devices/system/memory/memoryXXX/ have the same value, e.g.
> > (for the test machine, one memory block has 8 sections, that is 
> >  sections_per_block equals 8)
> > 
> > # cd /sys/devices/system/memory/memory100/
> > # cat phys_index end_phys_index 
> > 00000064
> > 00000064
> > 
> > Seems they should reflect the start/end section number respectively, which 
> > also matches what is said in Documentation/memory-hotplug.txt
> 
> This changes a user-visible interface.  Won't this break userspace?

Hi Dave, 

Hmm, I think so... Thank you for the reminder

Do you have some better ideas to fix this? Maybe we should leave the
code unchanged, just change the corresponding document (just it seems
that the end_phys_index will always be the same as phys_index)? And if
the section numbers are really needed, then we could create two new
files later, e.g. start_section_nr, end_section_nr? 

Thanks, 
Zhong
> 


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